81 513 319 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁶

TF target 2⁷⁵

P-1

B1 =	650000
B2 =	12675000

Status	Date	User	Residue	Shift	Software
Verified	2017-08-20	curtisc	FAB5365A54035B90	11983540	Windows Service,Prime95,v28.7,build 1
Verified	2026-04-04	-anonymous-	FAB5365A54035B90	24592533	Linux 64-bit,Prime95,v30.19,build 20

History

Date	User	Type	Result
2026-04-04	-anonymous-	C-LL	FAB5365A54035B90
2017-08-20	curtisc	C-LL	FAB5365A54035B90
2016-11-21	Judge Hale	NF-PM1	B1=650000, B2=12675000, E=12
2016-11-11	dh1	NF	no factor TF: 75-76
2016-11-11	Mark Rose	NF	no factor TF: 74-75
2016-11-08	Brian Beuning	NF	no factor TF: 73-74
2016-10-02	Judge Hale	NF	no factor TF: 72-73
2016-10-02	Judge Hale	NF	no factor TF: 71-72
2011-02-22	Ungelovende	NF	no factor TF: 70-71
2011-02-22	Ungelovende	NF	no factor TF: 69-70
2011-02-22	Ungelovende	NF	no factor TF: 68-69
2011-02-22	Ungelovende	NF	no factor TF: 67-68
2011-02-22	Ungelovende	NF	no factor TF: 65-67
2010-12-08	Architects Cubed	NF	no factor TF: 64-65